There are alot of good exterior finishes on the market. Spar urathan is the best in my book if using a spray can version.
However, if you want full moisture protection (or as best as can be expected) make your own (commomly called the Massey Finish) by mixing slow set epoxy (30 minute or longer set time if you can find it) and acetone. One part epoxy to three parts acetone and apply to the sides of the limbs or where ever with a rag or q-tip.
Don’t spend alot of time trying to rub it out smooth. Just apply and let flow out smooth on it’s own.
Put on two coats in no less than 8 hour intervals, allow 8 more hours to cure (12 is better in my book) then lightly sand with 220 or finer sand paper. Afterwards do it again. If at that point the area is fully covered and smooth you can use 0000 steel wool and buff to a satin finish. If not go with the two coats of mix again or until the area is smooth.
Any of the epoxy finish that gets on the glass can be wiped off while wet or lightly sanded and feather edged once dry. Then buffed with steel wool and will hardly be noticed.
Troy
